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Interest-Bearing Liabilities - Additional Information (Detail) - SEK (kr) kr in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Disclosure Of Interest Bearing Liabilities [Line Items] |  |
Borrowings | kr 38,041 | kr 46,873
Commercial papers [member] |  |
Disclosure Of Interest Bearing Liabilities [Line Items] |  |
Borrowings | kr 1,607 | 2,014
Weighted average yield percent | 2.788% |
Subsidiaries [Member] | Short-term borrowings [member] |  |
Disclosure Of Interest Bearing Liabilities [Line Items] |  |
Borrowings | kr 700 | kr 2,200
Parent company funding [member] |  |
Disclosure Of Interest Bearing Liabilities [Line Items] |  |
Weighted average interest rate of long term debt | 5.88% | 5.15%

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